Vegetable protein glue



Patented Oct. 16, 1934 v UNITED STATES PATENT OFFICE 1,971,404 vacuums;ruorsm GLUE Russell G. Petersonfllacoma, Was-1a., assign" to George H.Osgood, Tacoma, Wash.

No Drawing. Applicationgly 29, 1931,

. Serial No. as:

4 Claims. (cl. 87-17) The art of making glues from vegetable floursmadefroxmprotein-bearing materials, such as soya bean, peanut, cottonseed,linseed, 'castor bean, and the like, has been known and has been 5largely used on account of the .cheapness of the materials, but'dinicuity has been encountered in making such a glue which does notrequire the constant attention of an experienced glue-mixer on account01 the other materials formerly nec- 19 essary to make a-usable glue,such as caustic soda, silicate oi. soda, carbon bisulphide, and'thelike, which cannot be put into the glue itself in the dry state but mustbecaretullymeasured and mixed after the soils. bean flour, or otherconstituents, have been mixed with water.

I have found that such glues can be made] more highly water-resistant itthey are formedwith a water-soluble product of. cellulose. namelyviscose, and that they do not require the skill- 20 iul attention of anexpert in their preparation. Since these several vegetable meals are allslightly acid and since such acid content would separate thecellulose'in the viscose used. to make an insoluble compoundneutralize-the meal before it is used in making the glue. Thisneutralization 'may be eflected by the suitableuse of any soluble sodiumsalt, or any alkaline earth materials.

To this neutralized vegetable flour is added a water-soluble product ofcellulose, namely. viscose, in the proportion of about 25 to parts orthe'viscose 'to 100 parts of the neutralized meal. This viscose containsan excess oi. caustie. in order that it wfll be retained in liquid 35condition and this excess or caustic'acts as a,

solvent for the meal, while the cellulose in the viscoseactsas a meansof increasing its water- 'I'he viscose is prepared under standarddirections such as those published by Cross 8: Bevins, using rayon pulp,or other high grade wood pulp, as. a base. Other suitablematcrials's'uch as cottonstraw, can be used it-desired.

The wood, being glued, is slightly acid and co when such a glue, asabove described, is applied to the wood, the acids in the wood itselineutralize. the caustic of the glue and slightly acidiiies the glueline, which is then highly water -resistant. a

The glues are prepared in an aqu ous medium, in suitable proportions,about 250 parts 01 water to 100 parts of neutralized flour usuallylosicviscosecontaininganexcessotalkaliasa'.

dispersing medium'ior the meal. I

3. An adhesive composition comprising a -lieu-.- tralized vegetableprotein-bearing meal as a base; with cellulosic viscose containing, anexcess alkalinity which is used as a solvent for the meal and asswater-proofing agenttor the 4. An adhesive composition comprising aneutralized vegetable protein-bearing meal -andcellulosicviscosecontainlng an excess of alkali, which acts as a dimemedium for the meal, and which, when applied between the layers ofacidwood, is actedon by the'acidinthewood;

, to neutralize theexceascaustic or thecompound to form awater-resistant glue line. v

' RUSSILI G. N.

